/*
 * Copyright (c) 2017, 2018, Oracle and/or its affiliates.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 * conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided
 * with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used to
 * endorse or promote products derived from this software without specific prior written
 * permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.oracle.truffle.llvm.parser.metadata;

import java.util.Iterator;
import java.util.NoSuchElementException;

abstract class MDAggregateNode implements MDBaseNode, Iterable<MDBaseNode> {

    private final MDBaseNode[] elements;

    MDAggregateNode(int size) {
        elements = new MDBaseNode[size];
    }

    void set(int i, MDBaseNode element) {
        elements[i] = element;
    }

    MDBaseNode get(int i) {
        return elements[i];
    }

    @Override
    public void replace(MDBaseNode oldValue, MDBaseNode newValue) {
        for (int i = 0; i < elements.length; i++) {
            if (elements[i] == oldValue) {
                elements[i] = newValue;
            }
        }
    }

    @Override
    public Iterator<MDBaseNode> iterator() {
        return new Iterator<MDBaseNode>() {

            private int i = 0;

            @Override
            public boolean hasNext() {
                return i < elements.length;
            }

            @Override
            public MDBaseNode next() {
                if (i >= elements.length) {
                    throw new NoSuchElementException();
                }
                return elements[i++];
            }
        };
    }
}
